Sign-in with google_oauth2 auth failed
I created an account on gitlab.com via my github.com auth credentials.
When trying to sign-in using my google.com credentials the error page says: "Try logging in using your email/username, try recovering password. If neither works try contacting the GitLab administror." (to paraphrase)
The error page should mention the account might have been created using github.com, bitbucket.org, etc, auth credentials.